Question

An online clothing retailer monitors its order-filling process. Each week, the quality control manager selects a random sample of size n = 350 orders that have been filled but have not shipped. The contents of the shipping container are checked against the items ordered by the customer (including color and size categories), and the order is categorized as defective or non-defective. A p chart is used to identify whether or not the process is in control.

The graph below shows the proportion of defective orders for 20 consecutive weeks of samples.

3.4% of orders are incorrectly filled when the process is in control; treating the data from the 20 samples as one large sample, the proportion of defective items is 0.018.

Using the standard error of the sample proportion (rounded to 3 decimal places), calculate the center line, lower control limit, and upper control limit and add them to the control chart.(how to calculate)

The quality control engineer uses the p chart to identify whether or not the order-filling process is in a state of control. She concludes that the process is________________ because______________________________________________ .

Instead of a p chart, suppose that the online clothing retailer uses a np chart to identify whether or not the process is in a state of control.

The quality control engineer would draw the center line at________________ , the UCL at______________ , and the LCL at_______________ ; she would conclude that the order-filling process is__________________ .

Answer #1

A quality manager asked his team to implement p control chart
for a process that was recently introduced. The team collected
samples of size n = 100 parts hourly over a period of 30 hours and
determined the proportion of nonconforming parts for each sample.
The mean proportion of nonconforming parts for 30 samples turned
out to be 0.025.
Determine the upper and lower control limits for the p chart.
(2 Points)
Discuss how you will use the p Chart...

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a. Calculate the centerline, the upper control
limit (UCL), and the lower control limit (LCL) for the p¯p¯ chart.
(Round your answers to 3 decimal places.)
centerline-
Upper control limit-
Lower control limit-
b. An engineer inspects the next batch of 2,200
steel rods and finds that 5.5% are defective. Is the manufacturing
process under...

An online clothing retailer sells men’s white undershirts. In
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units (so this is a periodic review system). When the retailer
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time of 3...

As part of a quality improvement program, your mail-order
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According to company standards, an order is shipped on time if it
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4 5...

HCH Manufacturing has decided to use a p-Chart with 2-sigma
control limits to monitor the proportion of defective steel bars
produced by their production process. The quality control manager
randomly samples 250 steel bars at 12 successively selected time
periods and counts the number of defective steel bars in the
sample.
Sample Defects
1 7
2 10
3 14
4 8
5 9
6 11
7 9
8 9
9 14
10 11
11 7
12 8
Step 1 of...

A manufacturing company makes runners for cabinet drawers. To
assess the quality of the manufacturing process, the company
collected one sample of 300 consecutively manufactured runners each
day for 20 days and counted the number of defective items. The
resulting sample data are:
Sample: 1 2 3 4 5 6 7 8 9
10
Sample Size: 300 300 300 300 300 300 300 300 300
300
Defectives: 8 6
11 15 12
11 9 6 5 4
The Upper Control Limit, UCL, for a p control chart based on the
above data is

5a
as part of a quality
improvement program, your mail-order company is evaluating the
process of filling customer orders. According to company standards,
an order is shipped on time if it is sent within two working days
of the time it is received. You select an SRS of 234 of the 6,000
orders received in the past month for an audit. The audit reveals
that 101 of these orders were shipped on time.
What is the
upper endpoint of a...

Analysis: This section should include the issue register as a
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chart, a waste table and/or value-added analysis table. Flow
analysis or simulation of this case study might be possible but
might require making a lot of assumptions given the provided
data.
The first part of the project:
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Please answer the following Case
analysis questions
1-How is New Balance performing compared to its primary rivals?
How will the acquisition of Reebok by Adidas impact the structure
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2- What issues does New Balance management need to address?
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